open your sources.list as root
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gksu gedit /etc/apt/sources.list
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deb http://archive.ubuntu.com/ubuntu/ nadia main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ nadia-updates main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ nadia-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ nadia partner
deb http://packages.medibuntu.org/ nadia free non-free
deb http://archive.getdeb.net/ubuntu quantal-getdeb games
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apt update












